NCB5R_MORAP
ID NCB5R_MORAP Reviewed; 298 AA.
AC Q9UR35;
DT 29-APR-2008, integrated into UniProtKB/Swiss-Prot.
DT 01-MAY-2000, sequence version 1.
DT 03-AUG-2022, entry version 79.
DE RecName: Full=NADH-cytochrome b5 reductase 1;
DE EC=1.6.2.2 {ECO:0000250|UniProtKB:P38626};
DE AltName: Full=Microsomal cytochrome b reductase;
GN Name=CBR1;
OS Mortierella alpina (Oleaginous fungus) (Mortierella renispora).
OC Eukaryota; Fungi; Fungi incertae sedis; Mucoromycota; Mortierellomycotina;
OC Mortierellomycetes; Mortierellales; Mortierellaceae; Mortierella.
OX NCBI_TaxID=64518;
RN [1]
RP NUCLEOTIDE SEQUENCE.
RC STRAIN=1S-4;
RX PubMed=10473389; DOI=10.1128/aem.65.9.3873-3879.1999;
RA Sakuradani E., Kobayashi M., Shimizu S.;
RT "Identification of an NADH-cytochrome b(5) reductase gene from an
RT arachidonic acid-producing fungus, Mortierella alpina 1S-4, by sequencing
RT of the encoding cDNA and heterologous expression in a fungus, Aspergillus
RT oryzae.";
RL Appl. Environ. Microbiol. 65:3873-3879(1999).
CC -!- FUNCTION: NADH-dependent reductase for DPH3 and cytochrome b5. Required
CC for the first step of diphthamide biosynthesis, a post-translational
CC modification of histidine which occurs in elongation factor 2. DPH1 and
CC DPH2 transfer a 3-amino-3-carboxypropyl (ACP) group from S-adenosyl-L-
CC methionine (SAM) to a histidine residue, the reaction is assisted by a
CC reduction system comprising DPH3 and a NADH-dependent reductase,
CC predominantly CBR1. By reducing DPH3, also involved in the formation of
CC the tRNA wobble base modification mcm5s 2U (5-methoxycarbonylmethyl-2-
CC thiouridine), mediated by the elongator complex. The cytochrome b5/NADH
CC cytochrome b5 reductase electron transfer system supports the catalytic
CC activity of several sterol biosynthetic enzymes.
CC {ECO:0000250|UniProtKB:P38626}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=2 Fe(III)-[cytochrome b5] + NADH = 2 Fe(II)-[cytochrome b5] +
CC H(+) + NAD(+); Xref=Rhea:RHEA:46680, Rhea:RHEA-COMP:10438, Rhea:RHEA-
CC COMP:10439, ChEBI:CHEBI:15378, ChEBI:CHEBI:29033, ChEBI:CHEBI:29034,
CC ChEBI:CHEBI:57540, ChEBI:CHEBI:57945; EC=1.6.2.2;
CC Evidence={ECO:0000250|UniProtKB:P38626};
CC -!- CATALYTIC ACTIVITY:
CC Reaction=2 Fe(3+)-[Dph3] + NADH = 2 Fe(2+)-[Dph3] + H(+) + NAD(+);
CC Xref=Rhea:RHEA:71231, Rhea:RHEA-COMP:18002, Rhea:RHEA-COMP:18003,
CC ChEBI:CHEBI:15378, ChEBI:CHEBI:29033, ChEBI:CHEBI:29034,
CC ChEBI:CHEBI:57540, ChEBI:CHEBI:57945, ChEBI:CHEBI:83228;
CC Evidence={ECO:0000250|UniProtKB:P38626};
CC PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:71232;
CC Evidence={ECO:0000250|UniProtKB:P38626};
CC -!- COFACTOR:
CC Name=FAD; Xref=ChEBI:CHEBI:57692; Evidence={ECO:0000255};
CC -!- PATHWAY: Protein modification; peptidyl-diphthamide biosynthesis.
CC {ECO:0000250|UniProtKB:P38626}.
CC -!- SUBUNIT: Monomer. Component of the 2-(3-amino-3-carboxypropyl)histidine
CC synthase complex composed of DPH1, DPH2, DPH3 and a NADH-dependent
CC reductase, predominantly CBR1. {ECO:0000250|UniProtKB:P38626}.
CC -!- SUBCELLULAR LOCATION: Mitochondrion outer membrane
CC {ECO:0000250|UniProtKB:P38626}; Single-pass membrane protein
CC {ECO:0000255}.
CC -!- SIMILARITY: Belongs to the flavoprotein pyridine nucleotide cytochrome
CC reductase family. {ECO:0000305}.
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DR EMBL; AB020034; BAA85586.1; -; mRNA.
DR EMBL; AB020035; BAA85587.1; -; Genomic_DNA.
DR AlphaFoldDB; Q9UR35; -.
DR SMR; Q9UR35; -.
DR UniPathway; UPA00559; -.
DR GO; GO:0005789; C:endoplasmic reticulum membrane; IEA:UniProtKB-SubCell.
DR GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR GO; GO:0005741; C:mitochondrial outer membrane; IEA:UniProtKB-SubCell.
DR GO; GO:0004128; F:cytochrome-b5 reductase activity, acting on NAD(P)H; ISS:UniProtKB.
DR GO; GO:0003954; F:NADH dehydrogenase activity; ISS:UniProtKB.
DR GO; GO:0017183; P:peptidyl-diphthamide biosynthetic process from peptidyl-histidine; ISS:UniProtKB.
DR GO; GO:0002926; P:tRNA wobble base 5-methoxycarbonylmethyl-2-thiouridinylation; ISS:UniProtKB.
DR Gene3D; 3.40.50.80; -; 1.
DR InterPro; IPR001834; CBR-like.
DR InterPro; IPR008333; Cbr1-like_FAD-bd_dom.
DR InterPro; IPR017927; FAD-bd_FR_type.
DR InterPro; IPR001709; Flavoprot_Pyr_Nucl_cyt_Rdtase.
DR InterPro; IPR039261; FNR_nucleotide-bd.
DR InterPro; IPR001433; OxRdtase_FAD/NAD-bd.
DR InterPro; IPR017938; Riboflavin_synthase-like_b-brl.
DR PANTHER; PTHR19370; PTHR19370; 1.
DR Pfam; PF00970; FAD_binding_6; 1.
DR Pfam; PF00175; NAD_binding_1; 1.
DR PRINTS; PR00371; FPNCR.
DR SUPFAM; SSF52343; SSF52343; 1.
DR SUPFAM; SSF63380; SSF63380; 1.
DR PROSITE; PS51384; FAD_FR; 1.
PE 2: Evidence at transcript level;
KW FAD; Flavoprotein; Membrane; Mitochondrion; Mitochondrion outer membrane;
KW NAD; Oxidoreductase; Transferase; Transmembrane; Transmembrane helix.
FT CHAIN 1..298
FT /note="NADH-cytochrome b5 reductase 1"
FT /id="PRO_0000330158"
FT TRANSMEM 14..34
FT /note="Helical"
FT /evidence="ECO:0000255"
FT DOMAIN 56..159
FT /note="FAD-binding FR-type"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00716"
FT BINDING 139..154
FT /ligand="FAD"
FT /ligand_id="ChEBI:CHEBI:57692"
FT /evidence="ECO:0000250"
FT BINDING 165..197
FT /ligand="FAD"
FT /ligand_id="ChEBI:CHEBI:57692"
FT /evidence="ECO:0000250"
SQ SEQUENCE 298 AA; 32331 MW; 31764BE085A802C4 CRC64;
MTLSNPAIAA ASGVILAGAY LIDPSALPFV AAGVAATWAR VLFKKTAVKT PPMDPKEYRK
FKLVDKVHCS PNTAMYKFAL PHEDDLLNLP IGQHISIMAN INGKDISRSY TPTSSSDDVG
HFVLCIKSYP QGNISKMFSE LSIGDSINAR GPKGQFSYTP NMCRAIGMIA GGTGLTPMLQ
IIRAIVKNPE DKTQVNFIFA NVTEEDIILK AELDLLSQKH PQFKVYYVLN NAPEGWTGGV
GFVNADMIKE HMPAPAADIK VLLCGPPPMV SAMSKITQDL GYDKVNAVSK LPDQVFKF
